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Earth's Atmosphere It is found experimentally that the electric field in a certain region of Earth's atmosphere is directed vertically down. At an altitude of 270 m the field has magnitude 60.0 N/C; at an altitudeof 170 m, the magnitude is 100 N/C. Find the amount of charge contained in a cube 100 m on edge, with horizontal faces at altitudes of170 and 270 m. Neglect the curvature of Earth.
Radiation at temperature Ti fills a thermally insulated cavity of volume V. If the cavity expands isentropically to volume rV, how much work is done by the radiation , as a fraction of its initial energy? How much work would be done if the expansion ..
Consider a simple plane pendulum consisting of mass m attached to a string of length l. find the tension of the pendulum string
A box sits at the top of an unfolding ramp. As the ramp isgradually tilted down from horizontal, the box will eventuallystart to slide down the ramp, the ramp then stops further tiltingand is held at this angle.
A juggler throws a ball straight up with some initial velocity. Half a second later, the juggler throws another ball straight up from the same height, then what is the initial velocity of each ball
Teo point charges are on the x-axis. The first is located at -4 meters and has a charge of -6 coulombs. Where on the x-axis is the electric field zero
A plank 2.00 cm thick and 16.9 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m horizontally over the sea below, find the shear modulus of the wood
A pump is needed to lift 750 L of water per minute a distance of 25.0 M. What power (in KW) must the pump be able to deliver? (1L of water has a mass of 1 kg.)
Short pulses of laser light traveling in the x-direction with a diameter of 1 mm are incident on a perfect mirror. The pulses are 10^-13 seconds long and have a repetition rate of 10 Hz, each with an energy of 1 mJ.
What is braking distance for the first train
A popgun uses a spring for which k=20 N/cm. How high can the gun shoot a 5.0 g projectile
The coil of a galvanometer has a resistance of 19.8 ?, and its meter deflects full scale when a current of 6.30 mA passes through it. What is the maximum current that this ammeter can read
A cyclist is moving down a steep hill that has a grade of 20%. The rider is traveling at 3.5 m/s. The combined weight of the rider and cycle is 800N and the dynamic coefficient of friction between the tires and the road is 0.7. If the rider sudden..
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